Metal lining



Dec. 5, 1933. J RlTTER 1,937,980

METAL LINING Filed April 22, 1932 mnmn "in" j? nb'l 1 .5 )NVENTQWITNESSES J0 mfiz 6/ BY hym M 6 ATTORNEY Patented Dec. 5,1933

UNITED STATES PATENT OFFICE 3 Claims.

An object of the invention is to provide a sheet metal panel fortelephone booths and for other purposes which has an embossed surfacewhich renders it diiiicult to deface or mutilate the metal 5 panel bywriting, drawing, or tracing thereon.

Another object of the invention is to emboss the metal panel withirregularly shaped protuberances which are staggered, there being nocurved or straight lines separating the protuberances and there beingapproximately twenty distinct protuberances to the square inch.

A further object of the invention is to provide a sheet metal panel orlining having sound-proof characteristics.

Additional objects of the invention will appear in the followingspecification in which the preferred form of the invention is described.

In the drawing similar reference characters refer to similar parts inthe several views, of which Figure 1 is a sectional view of a telephonebooth provided with the metal panels,

Figure 2 is an enlarged fragmentary view illustrating the face of one ofthe panels, and

Figure 8 is a sectional View on the line 33 of Figure 2. I

It is customary to use metal panels or linings in telephone booths andin other public places, but the metal panels or linings which are nowemployed'are defaced and damaged by persons writing, drawing and tracingthereon. This makes it necessary for the telephone company or otherinterested parties to keep men employed to renovate the metal panels,which entails a very considerable expense. The improved metal panel,which is the subject matter of this application, overcomes thisdifficulty, for it has been found, after considerable research and manyexperiments, that where the metal panel is embossed with many irregularstaggered protuberances which are separated by irregular lines it isexceedingly difiicult to write or draw on the metal panel and thatanyone attempting to do so soon becomes discouraged.

By referring to the drawing it will be seen that the metal panel isshown in connectionfwith its use as a lining for telephone booths.However, it will be understood that the metal panel, which is thesubject matter of this application, may be used for any desired purpose.

The metal panel 5, when used in a telephone booth, may be secured to theinner side of the telephone booth by any suitable means and it will lieclosely to the walls 6 of the telephone booth. The drawing shows themetal panel 5 with a molding 7, but it will be understood that thismolding 7 may be omitted, or that any other desired molding may beemployed.

The metal panel 5 is embossed with protuberances or bulges 8 which areirregular in shape and size and which are staggered, as best shown Theseprotuberances 8, with which the ther render difiicult writing on thepanel, certain ones of the bulges project out farther than others fromthe mean plane of the panel (Fig. 3). These bulges (see those near thetop of the figure) are struck on slightly different arcs, their sidebeing thereby varied.

Since some of the bulges are of slightly varying size it follows thatthey are made up of a succession of sweeps of irregular height andlength, and since this occurs in every cross-sectional direction of thepanel it becomes apparent that the surface of the panel is interruptedsufiiciently well to prevent legible writing of any use ful size. I

With this arrangement of the small protuberances 8 it is practicallyimpossible for any one to write or draw on the metal panel 5, for anypressure on a pencil at the protuberances will direct the pencil inunexpected directions, which will make it impossible to direct thepencil in any definite or desired manner. It will also be seen that theprotuberances 8 provide air spaces 9 at the rear surface of the metalpanel 5, these air spaces 9 being irregular inshape and serving to givethe metal panel 5 sound-proof characteristics.

What is claimed is:

1. A lining for booths comprising a panel embossed with roundeddome-shaped bulges of which certain ones project out farther than othersfrom the mean plane of the panel, the various bulgesbeing struck ondifferent arcs to vary the size of the bulges, said bulges being closelyformed and of irregular contour.

2. A lining for booths comprising a panel em bossed with roundeddome-shaped bulges of closely connected irregular contour, said bulgesdefining a succession of sweeps of irregular height and length in anycross-sectional direction of the panel.

3. A booth comprising a wall, a sound-proofing panel on one side of thewall, said panel being embossed with dome-shaped bulges bowing out fromsaid side, said dome-shaped bulges comprising sweeps of irregular heightand length in any cross-sectional direction of the panel to provideirregular air spaces.

JOHN BITTER.

